#custom filters for Octopress

 require './plugins/backtick_code_block'
 require './plugins/post_filters'
 require './plugins/raw'

 require './plugins/date'

 require 'rubypants'

 
 module OctopressFilters

   include BacktickCodeBlock
   include TemplateWrapper
   def pre_filter(input)
     input = render_code_block(input)
     input.gsub /(<figure.+?>.+?<\/figure>)/m do
       safe_wrap($1)
     end
   end
   def post_filter(input)
     input = unwrap(input)
     RubyPants.new(input).to_html
   end
 end
 
 module Jekyll
   class ContentFilters < PostFilter
     include OctopressFilters
     def pre_render(post)

       if post.ext.match('html|textile|markdown|md|haml|slim|xml')

         post.content = pre_filter(post.content)
       end

     end
     def post_render(post)

       if post.ext.match('html|textile|markdown|md|haml|slim|xml')

         post.content = post_filter(post.content)
       end

     end
   end
 end
 
 
 module OctopressLiquidFilters

   include Octopress::Date
 

   # Used on the blog index to split posts on the <!--more--> marker

   def excerpt(input)

     if input.index(/<!--\s*more\s*-->/i)
       input.split(/<!--\s*more\s*-->/i)[0]

     else
       input
     end
   end

 
   # Checks for excerpts (helpful for template conditionals)
   def has_excerpt(input)
     input =~ /<!--\s*more\s*-->/i ? true : false
   end

 
   # Summary is used on the Archive pages to return the first block of content from a post.
   def summary(input)
     if input.index(/\n\n/)
       input.split(/\n\n/)[0]

     else
       input
     end
   end

   # Extracts raw content DIV from template, used for page description as {{ content }}
   # contains complete sub-template code on main page level
   def raw_content(input)

     /<div class="entry-content">(?<content>[\s\S]*?)<\/div>\s*<(footer|\/article)>/ =~ input

     return (content.nil?) ? input : content
   end
 

   # Escapes CDATA sections in post content
   def cdata_escape(input)
     input.gsub(/<!\[CDATA\[/, '&lt;![CDATA[').gsub(/\]\]>/, ']]&gt;')
   end
 

   # Replaces relative urls with full urls

   def expand_urls(input, url='')
     url ||= '/'

     input.gsub /(\s+(href|src)\s*=\s*["|']{1})(\/[^\"'>]*)/ do

       $1+url+$3
     end
   end

   # Improved version of Liquid's truncate:
   # - Doesn't cut in the middle of a word.
   # - Uses typographically correct ellipsis (…) insted of '...'
   def truncate(input, length)
     if input.length > length && input[0..(length-1)] =~ /(.+)\b.+$/im
       $1.strip + ' …'
     else
       input
     end
   end
 
   # Improved version of Liquid's truncatewords:
   # - Uses typographically correct ellipsis (…) insted of '...'
   def truncatewords(input, length)
     truncate = input.split(' ')
     if truncate.length > length
       truncate[0..length-1].join(' ').strip + ' …'
     else
       input
     end
   end
 
   # Condenses multiple spaces and tabs into a single space
   def condense_spaces(input)
     input.gsub(/\s{2,}/, ' ')
   end
 

   # Removes trailing forward slash from a string for easily appending url segments
   def strip_slash(input)
     if input =~ /(.+)\/$|^\/$/
       input = $1
     end
     input
   end
 
   # Returns a url without the protocol (http://)
   def shorthand_url(input)

     input.gsub /(https?:\/\/)(\S+)/ do

       $2
     end
   end

 
   # Returns a title cased string based on John Gruber's title case http://daringfireball.net/2008/08/title_case_update

   def titlecase(input)
     input.titlecase
   end

 end

 Liquid::Template.register_filter OctopressLiquidFilters